<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
  body{
      height: 100%;
      width: 100%;
      background-color: gray;
  }
</style>
<body>
    <button>测试项目</button>
</body>
<script>
     function add(m,mi){
         return m+mi
     }
     console.log(add(1,3));
</script>
</html>